Exercise ball



FIG. 1 is a front perspective view of an exercise ball, showing our newdesign;

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIGS. 4 and 5 are opposing side views thereof.

FIG. 6 is a top view of thereof; and,

FIG. 7 is a bottom view thereof.

CLAIM The ornamental design for an exercise ball, as shown anddescribed.